Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa(3)
NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa - Write
"eval { $foo->isa($pkg) }" instead of "UNIVERSAL::isa($foo, $pkg)".
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
print UNIVERSAL::isa($obj, 'Foo::Bar') ? 'yes' : 'no'; #not ok
print eval { $obj->isa('Foo::Bar') } ? 'yes' : 'no'; #ok
As of Perl 5.9.3, the use of "UNIVERSAL::isa" as a function has been
deprecated and the method form is preferred instead. Formerly, the
functional form was recommended because it gave valid results even when
the object was "undef" or an unblessed scalar. However, the functional
form makes it impossible for packages to override "isa()", a technique
which is crucial for implementing mock objects and some facades.
Another alternative to UNIVERSAL::isa is the "_INSTANCE" method of
Param::Util, which is faster.
See the CPAN module UNIVERSAL::isa for an incendiary discussion of this
topic.
CONFIGURATION
This Policy is not configurable except for the standard options.
SEE ALSO
Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalCan(3)
AUTHOR
Chris Dolan <cdolan@cpan.org>
COPYRIGHT
Copyright (c) 2006-2011 Chris Dolan.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself. The full text of this license can
be found in the LICENSE file included with this module.
perl v5.28.2 Perl::Critic::Policy::BuiltinFunctions::ProhibitUniversalIsa(3)
perl-critic 1.134.0 - Generated Mon Jun 3 07:18:39 CDT 2019